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How can we get a general idea of it understand the architecture of the table. Below are four questions I ask most often What is the primary key of a table A flat table is a story about a primary key. This is always my first question when I see a flat table. In some cases the answer is obvious but sometimes a check or even a search for the primary key is require. Sometimes there is no key at all. Sometimes primary key statements are not supporte by the actual state of the table. What functional dependencies are in the table In a sense functional dependence is the basis of information.

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Those it is the relationship between two sets that is information. For example the phrase each employee has exactly one position means two sets and a functional relationship between them. Employee Position. Understanding functional dependencies allows you to better Japan Telegram Number Data understand the data and the domain base on precise metrics whether there is a functional dependency or not. This is a simple and effective way of architectural data analysis. How do the two columns in the table relate This question is aske less frequently and is usually neee to examine in detail the relationship between two columns or two sets of columns. Columns can be relate asĀ  logic as in ER diagrams.

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Employees and positions are relate as N. In addition there are a number of more detaile metrics on the relationship between two columns. For example the types and number of connecte components of a bipartite graph the relationship of two columns in fact form Qatar Whatsapp Number List a bipartite graph. But this is already a deep architectural analysis which is not often neee. What is the functional definition of this column Usually we cannot identify all functional dependencies in tables. Because its long. Typically only those where the determinant and the target contain one column are identifie.

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